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EP1054919B1 - Procede en continu pour produire des polyamides a partir d'aminonitriles - Google Patents

Procede en continu pour produire des polyamides a partir d'aminonitriles Download PDF

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EP1054919B1
EP1054919B1 EP99910175A EP99910175A EP1054919B1 EP 1054919 B1 EP1054919 B1 EP 1054919B1 EP 99910175 A EP99910175 A EP 99910175A EP 99910175 A EP99910175 A EP 99910175A EP 1054919 B1 EP1054919 B1 EP 1054919B1
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liquid
weight
pressure
phase
mixture
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EP1054919A1 (fr
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Ralf Mohrschladt
Volker Hildebrandt
Eberhard Fuchs
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BASF SE
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
    • C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
    • C08G69/04—Preparatory processes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
    • C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
    • C08G69/08—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from amino-carboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
    • C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
    • C08G69/08—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from amino-carboxylic acids
    • C08G69/14—Lactams
    • C08G69/16—Preparatory processes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
    • C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
    • C08G69/26—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids
    • C08G69/28—Preparatory processes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
    • C08K3/011—Crosslinking or vulcanising agents, e.g. accelerators

Definitions

  • the present invention relates to a continuous production process of polyamides from aminonitriles and water at elevated temperature and increased pressure.
  • No. 4,629,776 describes a catalytic process for the production of polyamides from ⁇ -aminonitriles such as ⁇ -aminocapronitrile (ACN).
  • ACN is with Water in the presence of a catalytic amount of an oxidized Sulfur compound implemented as a catalyst. For example, sulfuric acid used as a catalyst.
  • No. 4,568,736 describes a similar catalytic process for the production of Polyamides described.
  • the catalyst used here is an oxygen-containing one Phosphorus compound, phosphoric acid or a phosphonic acid used.
  • EP-A-0 479 306 describes the preparation of polyamides from ⁇ -aminonitriles.
  • the ⁇ -aminonitriles are reacted with water in the presence of an oxygen-containing phosphorus compound as a catalyst.
  • an oxygen-containing phosphorus compound as a catalyst.
  • ammonia and water are continuously removed by expansion, and water is continuously added at the same time, the pressure being selected in the range from 14 to 24 ⁇ 10 6 Pa (14-24 bar) ,
  • DE-A-43 39 648 relates to a process for the production of caprolactam Reaction of aminocarbonitriles with water, in the liquid phase is carried out using heterogeneous catalysts.
  • heterogeneous Catalysts can be acidic, basic or amphoteric oxides of the elements of the 2. 3rd or 4th main group of the periodic table can be used.
  • titanium dioxide can be used.
  • the catalyst is in shape, for example of strands used.
  • the object of the present invention is to provide a method for Production of polyamides from aminonitriles and water, which improved Molecular weight gain and an improved space-time yield without Contamination of the product compared to the known methods guaranteed.
  • all aminonitriles i.e. Compounds that have both at least one amino and at least one Have nitrile group
  • ⁇ -aminonitriles are preferred where, in particular, ⁇ -aminoalkyl nitriles with 4 to 12 carbon atoms, more preferably 4 to 9 carbon atoms in the alkylene radical, or an aminoalkylaryl nitrile can be used with 8 to 13 carbon atoms, preference being given to those there be between the aromatic unit and the amino and nitrile group have an alkylene group with at least one carbon atom.
  • the Aminoalkylaryl nitriles are particularly preferred those which are the amino and Have nitrile group in the 1,4 position to each other.
  • Linear ⁇ -aminoalkyl nitriles are preferably used as the ⁇ -aminoalkyl nitrile, the alkylene radical (-CH 2 -) preferably containing 4 to 12 carbon atoms, more preferably 4 to 9 carbon atoms, such as 6-amino-1-cyanopentane (6-aminocapronitrile), 7-amino-1-cyanohexane, 8-amino-1-cyanoheptane, 9-amino-1-cyanooctane, 10-amino-1-cyanononane, particularly preferably 6-aminocapronitrile.
  • 6-amino-1-cyanopentane 6-aminocapronitrile
  • 7-amino-1-cyanohexane 8-amino-1-cyanoheptane
  • 9-amino-1-cyanooctane 10-amino-1-cyanononane
  • 10-amino-1-cyanononane particularly preferably 6-
  • 6-aminocapronitrile is usually obtained by hydrogenating adiponitrile by known processes, for example described in DE-A 836,938, DE-A 848,654 or US 5 151 543.
  • Aliphatic C 4 -C 10 - ⁇ , ⁇ -dicarboxylic acids such as succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, preferably adipic acid and sebacic acid, particularly preferably adipic acid, and aromatic C 8 -C 12 dicarboxylic acids can be used as dicarboxylic acids such as terephthalic acid and C 5 -C 8 cycloalkanedicarboxylic acids such as cyclohexanedicarboxylic acid.
  • ⁇ ⁇ -diamine with 4 to 10 carbon atoms
  • Pentamethylene diamine Pentamethylene diamine
  • hexamethylene diamine hexamethylene diamine
  • heptamethylene diamine Octamethylene diamine
  • nonamethylene diamine and decamethylene diamine are preferred Use hexamethylenediamine.
  • salts from the dicarboxylic acids mentioned and Use diamines especially the salt from adipic acid and Hexamethylenediamine, so-called AH salt.
  • the ⁇ , ⁇ -C 2 -C 12 dinitrile used is preferably aliphatic dinitrile, such as 1,4-dicyanobutane (adiponitrile), 1,5-dicyanopentane, 1,6-dicyanhexane, 1,7-dicyanheptane, 1,8- Dicyanoctane, 1,9-dicyannonane, 1,10-dicyandecane, particularly preferably adiponitrile.
  • diamines, dinitriles and aminonitriles can also be obtained derive branched alkylene or arylene or alkylarylenes.
  • ⁇ -C 5 -C 12 amino acid there can be 5-aminopentanoic acid, 6-aminohexanoic acid, 7-aminoheptanoic acid, 8-aminooctanoic acid, 9-aminononanoic acid, 10-aminodecanoic acid, 11-aminoundecanoic acid and 12-aminododecanoic acid, preferably 6-aminohexanoic acid , deploy.
  • a first stage an ammonitrile is heated with water, at a temperature of about 90 to about 400 ° C, preferably about 180 to about 310 ° C and in particular at about 220 to about 270 ° C, a pressure from about 0.1 to about 15 x 10 6 Pa, preferably from about 1 to about 10 x 10 6 Pa, and in particular from about 4 to about 9 x 10 6 Pa.
  • pressure and temperature can be coordinated with one another in such a way that a liquid or a solid phase and a mixture of liquid or solid phase and a gaseous phase are obtained.
  • water is added in a molar ratio of aminoalkyl nitrile Water in the range from 1: 1 to 1:10, particularly preferably from 1: 2 to 1: 8, in whole particularly preferably from 1: 2 to 1: 6, a, the use of water in the Excess, based on the aminoalkyl nitrile used, is preferred.
  • the liquid or solid phase corresponds to or Mixture of liquid and solid phases of the reaction mixture, while the gaseous phase is separated.
  • the gaseous phase immediately from the liquid or solid phase or the mixture solid or liquid phase are separated, or that within this stage
  • the reaction mixture can be two-phase liquid-gas, solid-gas or present in liquid / solid-gaseous form.
  • pressure and temperature can also be coordinated so that the reaction mixture is single-phase solid or liquid.
  • the gas phase can be separated by using stirred or non-stirred Separation boilers or cascade cascades as well as through the use of evaporators take place, e.g. by circulation evaporator or Thin film evaporators, e.g. through film extruder or through Ring disc reactors that guarantee an enlarged phase interface. If necessary, pumping around the reaction mixture or using a Loop reactor necessary to enlarge the phase interface. Of further separation of the gas phase by the addition of water vapor or inert gas can be conveyed into the liquid phase.
  • the pressure is preferably set at a preselected temperature so that it is less than the equilibrium vapor pressure of ammonia, but greater than that Equilibrium vapor pressure of the other components in the reaction mixture at the given temperature. In this way, the separation of Ammonia favors and thus accelerates the hydrolysis of the acid amide groups become.
  • a pressure which is greater is preferably selected than the vapor pressure belonging to the melt temperature of the reaction mixture pure water, but less than the equilibrium vapor pressure of ammonia.
  • a vertical flow tube is used, the bottom up is flowed through and, if desired, another one above the product outlet Has opening for gas phase separation.
  • This tubular reactor can be complete or partially filled with catalyst granules.
  • the embodiment is the vertical reactor in two-phase operation filled with catalyst material up to the phase boundary.
  • the Pressure selected so that the reaction mixture is liquid in one phase, i.e. in the No gas phase reactor is present.
  • a flow tube filled exclusively with Catalyst material.
  • the aminonitrile / water mixture is introduced before first stage heated with the help of a heat exchanger.
  • nitrile groups are usually determined by means of IR spectroscopy (CN valence vibration at 2247 wavenumbers), NMR or HPLC, preferred by IR spectroscopy.
  • the reaction in stage 1 also in the presence of oxygen-containing phosphorus compounds, in particular phosphoric acid, phosphorous acid and hypophosphorous acid and their alkali metal and alkaline earth metal salts and ammonium salts such as Na 3 PO 4 , NaH 2 PO 4 , Na 2 HPO 4 , NaH 2 PO 3 , Na 2 HPO 3 , NaH 2 PO 2 , K 3 PO 4 , KH 2 PO 4 , K 2 HPO 4 , KH 2 PO 3 , K 2 HPO 3 , KH 2 PO 2 , using the Molar ratio of ⁇ -aminonitrile to phosphorus compounds in the range from 0.01: 1 to 1: 1, preferably from 0.01: 1 to 0.1: 1.
  • oxygen-containing phosphorus compounds in particular phosphoric acid, phosphorous acid and hypophosphorous acid and their alkali metal and alkaline earth metal salts and ammonium salts
  • oxygen-containing phosphorus compounds in particular phosphoric acid, phosphorous acid and hypophosphorous acid and their al
  • the reaction is carried out in stage 1 in a flow tube which contains a Bronsted acid catalyst selected from a beta zeolite, layered silicate or a titanium dioxide catalyst composed of 70 to 100% by weight of anatase and 0-30% by weight of rutile , in which up to 40% by weight of the titanium dioxide can be replaced by tungsten oxide.
  • a Bronsted acid catalyst selected from a beta zeolite, layered silicate or a titanium dioxide catalyst composed of 70 to 100% by weight of anatase and 0-30% by weight of rutile , in which up to 40% by weight of the titanium dioxide can be replaced by tungsten oxide.
  • a very pure aminonitrile is used, the proportion of anatase in the titanium dioxide catalyst should be as high as possible.
  • a pure anatase catalyst is preferably used.
  • the aminonitrile used contains impurities, for example 1 to 3% by weight of impurities, a titanium dioxide catalyst which contains a mixture of anatase and
  • the proportion of anatase is preferably 70 to 80% by weight and the proportion of rutile is 20 to 30% by weight.
  • a titanium dioxide catalyst composed of approximately 70% by weight of anatase and approximately 30% by weight of rutile is particularly preferably used.
  • the catalyst preferably has a pore volume of 0.1 to 5 ml / g, particularly preferably 0.2 to 0.5 ml / g.
  • the average pore diameter is preferably 0.005 to 0.1 ⁇ m, particularly preferably 0.01 to 0.06 ⁇ m. When working with highly viscous products, the medium pore diameter should be large.
  • the cutting hardness is preferably greater than 20 N, particularly preferably> 25 N.
  • the BET surface area is preferably more than 40 m 2 / g, particularly preferably more than 100 m 2 / g. If the BET surface area is chosen to be smaller, the bulk volume should be chosen accordingly in order to ensure sufficient catalyst activity.
  • Particularly preferred catalysts have the following properties: 100% anatase; 0.3 ml / g pore volume; 0.02 ⁇ m mean pore diameter; 32 N cutting hardness; 116 m 2 / g BET surface area or 84% by weight anatase; 16 wt% rutile; 0.3 ml / g pore volume; 0.03 ⁇ m mean pore diameter; 26 N cutting hardness; 46 m 2 / g BET surface area.
  • the catalysts can be produced from commercially available powders such as those offered by Degussa, Finti or Kemira. When a proportion of tungsten oxide is used, up to 40% by weight, preferably up to 30% by weight, particularly preferably 15 to 25% by weight, of the titanium dioxide are replaced by tungsten oxide.
  • the catalysts can be assembled as described in Ertl, Knözinger, Weitkamp: "Handbook of heterogeneous catalysis", VCH Weinheim, 1997, pages 98ff.
  • the catalyst can be used in any suitable form. It is preferably used in the form of moldings, strands or granules, in particular granules. The granulate is preferably so large that it can be easily separated from the product mixture and does not impair the flowability of the product during the reaction.
  • the granular shape of the catalyst makes it possible to discharge it from the first Separate the stage mechanically.
  • mechanical filters or Sieves provided on the discharge of the first stage.
  • the catalyst is also in the second and / or third stage also used, it is preferably in the same form.
  • the reaction mixture obtained in the first stage is heated in stage 2 at a temperature of about 200 (150) to about 350 (400) ° C, preferably a temperature in the range of about 210 (200) to about 330 (330) ° C and particularly in the range of about 230 (230) to about 270 (290) ° C and a pressure that is lower than the pressure in stage 1 further implemented.
  • the pressure in the second stage is at least about 0.5 x 10 6 Pa lower than the pressure in stage 1, with the pressure generally in the range from about 0.1 to about 45 x 10 6 Pa, preferably about 0.5 up to about 15 x 10 6 Pa and in particular about 2 to about 6 x 10 6 Pa (values in brackets: without catalyst).
  • step 2 the temperature and pressure are selected so that a first Gas phase and a first liquid or first solid phase or a mixture of the first liquid and first solid phase are obtained, and the first gas phase from the first liquid or first solid phase or the mixture of first liquid and first solid phase is separated.
  • the first gaseous phase consisting essentially of ammonia and water vapor is generally removed continuously using a distillation device, like a distillation column. Those possibly co-separated in this distillation organic components of the distillate, predominantly unreacted aminonitrile, can in stage 1 and / or stage 2 completely or partially returned.
  • the residence time of the reaction mixture in stage 2 is not subject to any Limitations, but is generally from about 10 minutes to about 5 Hours, preferably about 30 minutes to about 3 hours.
  • the product line between the first and second stage may contain packing, such as Raschig rings or Sulzer mixing elements that provide controlled relaxation allow the reaction mixture in the gas phase. This is particularly true the single-phase operation too.
  • the reactor of the second stage preferably also contains the one according to the invention Catalyst material, especially in granular form. It was found that the Reactor compared to a catalyst-free reactor especially at higher ones Press and / or if there is a large excess of water in the reaction mixture enables a further improvement of the product properties. Temperature and Pressure should be chosen so that the viscosity of the reaction mixture is small remains enough to avoid clogging of the catalyst surface. According to the invention, sieves or Filters are used that guarantee the purity of the reaction mixture and the Separate the catalyst from the reaction mixture.
  • the first liquid or the first solid phase or the mixture is formed first liquid and first solid phase with a gaseous or liquid phase, which contains water, preferably water or steam. This happens continuously.
  • the amount of water added (as a liquid) is preferably in the range of about 50 to about 1500 ml, more preferably about 100 to about 500 ml, each based on 1 kg of the first liquid or first solid phase or the mixture of first liquid and first solid Phase.
  • This water addition primarily causes those in stage 2 Water losses are compensated and the hydrolysis of acid amide groups in the Reaction mixture promoted. This results in another advantage of this invention, that the mixture of the starting products, as used in stage 1, only can be used with a small excess of water.
  • the water-containing gaseous or liquid phase before the Initiation in stage 3 preheated in a heat exchanger and then with the first liquid or the first solid phase or the mixture of first solid and first liquid phase mixed.
  • mixing elements can be in the reactor are used to promote the mixing of the components.
  • Stage 3 can be operated at a temperature of 150 to 370 ° C and a pressure of 0.1 to 30 x 10 6 Pa. If a catalyst bed according to the invention is present, the conditions applicable to stage 1 can be applied. Otherwise, the temperature is preferably 180 to 300 ° C, particularly preferably 220 to 280 ° C. The pressure is preferably 1 to 10 x 10 6 Pa, particularly preferably 2 x 10 6 to 7 x 10 6 Pa.
  • Pressure and temperature can be coordinated so that the Reaction mixture is single-phase liquid or single-phase solid.
  • pressure and temperature are chosen so that a liquid or a solid phase or a mixture of solid and liquid phase and a gaseous phase can be obtained.
  • the liquid or solid phase or the mixture of liquid and solid phase Product mixture while the gaseous phase is separated. It can in Under this stage, the gaseous phase immediately from the liquid or solid Phase or the mixture of solid or liquid phase are separated, or the reaction mixture formed within this stage can be biphasic liquid-gaseous, solid-gaseous or liquid / solid-gaseous.
  • the pressure can be set to is less than the equilibrium vapor pressure of ammonia, but greater than that Equilibrium vapor pressure of the other components in the reaction mixture at the given temperature. In this way, the separation of Ammonia favors and thus accelerates the hydrolysis of the acid amide groups become.
  • the apparatus / reactors that can be used in this stage can be used with those of the stage 1, as discussed above, be identical.
  • the dwell time at this level is also not subject to any restrictions for economic reasons, however, they are generally chosen between about 10 minutes to about 10 hours, preferably between about 60 to about 8 hours, more preferably from about 60 minutes to about 6 Hours.
  • the product mixture obtained in stage 3 can then, as described below, to be processed further.
  • the product mixture of stage 3 is subjected to a post-condensation in a fourth stage at a temperature of approximately 200 to approximately 350 ° C., preferably a temperature of approximately 220 to 300 ° C. and in particular approximately 240 to 270 ° C.
  • Step 4 is carried out at a pressure which is below the pressure of step 3, and preferably in a range from approximately 5 to 1000 ⁇ 10 3 Pa, more preferably approximately 10 to approximately 300 ⁇ 10 3 Pa.
  • temperature and pressure are selected so that a second gas phase and a second liquid or solid phase or a mixture of second liquid and second solid phases which contain the polyamide are obtained.
  • the post-condensation according to stage 4 is preferably carried out so that the relative viscosity (measured at a temperature of 25 ° C and a Concentration of 1 g polymer per 100 ml in 96 wt .-% sulfuric acid) des Polyamides have a value in the range of about 1.6 to about 3.5.
  • the residence time of the reaction mixture in stage 4 depends in particular on the desired relative viscosity, temperature, pressure and that in step 3 amount of water added.
  • stage 3 is operated in a single phase, the product line can switch between the Level 3 and level 4, if applicable, packing consisting of e.g. from Raschig rings or Sulzer mixing elements are used, which provide controlled relaxation enable the reaction mixture in the gas phase.
  • packing consisting of e.g. from Raschig rings or Sulzer mixing elements are used, which provide controlled relaxation enable the reaction mixture in the gas phase.
  • step 3 can be dispensed with according to the invention and steps (1), (2) and (4) are carried out to produce the polyamide become.
  • This variant is preferably carried out as follows:
  • Stage 1 is implemented as described above.
  • the reaction mixture is treated in stage 2 as described above or at a temperature in the range from about 220 to about 300 ° C. and a pressure in the range from about 1 to about 7 ⁇ 10 6 Pa, the pressure in the second stage being at least 0. 5 x 10 6 Pa is lower than in stage 1.
  • the resulting first gas phase is separated from the first liquid phase.
  • the first liquid phase obtained in stage 2 is treated in stage 4 as in stage 1 or at a temperature in the range from about 220 to 300 ° C. and a pressure in the range from about 10 to about 300 ⁇ 10 3 Pa, the resultant second gas phase containing water and ammonia is separated from the second liquid phase.
  • the relative viscosity (measured as defined above) of the polyamide obtained is adjusted to a desired value in the range from approximately 1.6 to approximately 3.5 by selection of the temperature and the residence time.
  • the second liquid phase thus obtained is then produced using customary methods carried out and, if desired, processed.
  • step 1 or in step 3 or both in step 1 and also in step 3 the temperature and pressure are chosen so that a liquid or a solid phase or a mixture of liquid and solid phase and one gaseous phase are obtained, and the gaseous phase is separated.
  • FIG. 1 shows a device for performing the method according to the invention.
  • Chain extension or a branch or a combination of both carry out are used for branching or chain extension of polymers added in the individual stages. These substances are preferably added in stage 3 or 4.
  • Trifunctional amines or carboxylic acids as branching agents or crosslinkers. Examples Suitable at least trifunctional amines or carboxylic acids are described in EP-A-0 345 648.
  • the at least trifunctional amines have at least three Amino groups capable of reacting with carboxylic acid groups. She preferably have no carboxylic acid groups.
  • the least trifunctional Carboxylic acids have at least three capable of reacting with amines Carboxylic acid groups, for example in the form of their derivatives, such as esters, can be present.
  • the carboxylic acids preferably do not have any to react with Carboxylic acid groups enabled amino groups.
  • Carboxylic acids examples include trimesic acid, trimerized fatty acids that, for example, consist of Oleic acid can be produced and can have 50 to 60 carbon atoms, naphthalene polycarboxylic acids, such as naphthalene-1,3,5,7-tetracarboxylic acid. Are preferred the carboxylic acids defined organic compounds and not polymeric Links.
  • Amines with at least 3 amino groups are, for example, nitrilotrialkylamine, in particular nitrilotriethanamine, dialkylenetriamines, in particular diethylenetriamine, trialkylenetetramine and tetraalkylenepentamine, the alkylene radicals preferably being ethylene radicals.
  • Dendrimers can also be used as amines. The dendrimers preferably have the general formula I.
  • N preferably has an integer value of 3 or 4, in particular 3 and x has an integer value of 2 to 6, preferably 2 to 4, in particular 2.
  • the radicals R can also have the meanings indicated independently of one another.
  • the radical R is preferably a hydrogen atom or a radical - (CH 2 ) n -NH 2 .
  • Suitable carboxylic acids are those with 3 to 10 carboxylic acid groups, preferably 3 or 4 carboxylic acid groups.
  • Preferred carboxylic acids are those with aromatic and / or heterocyclic nuclei. Examples are benzyl, Naphthyl, anthracene, biphenyl, triphenyl or heterocycles such as pyridine, Bipyridine, pyrrole, indole, furan, thiophene, purine, quinoline, phenanthrene, Porphyrin, phthalocyanine, naphthalocyanine.
  • 3,5,3 ', 5'-biphenyltetracarboxylic acid phthalocyanine are preferred, Naphthalocyanine, 3,5,5 ', 5'-biphenyltetracarboxylic acid, 1,3,5,7-naphthalenetetracarboxylic acid, 2,4,6-pyridine tricarboxylic acid, 3,5,3'5'-bipyridyltetracarboxylic acid, 3,5,3'5'-benzophenonetetracarboxylic acid, 1,3,6,8-acridine tetracarboxylic acid, particularly preferably 1,3,5-benzene tricarboxylic acid (Trimesic acid) and 1,2,4,5-benzenetetracarboxylic acid.
  • Trimesic acid 1,2,4,5-benzenetetracarboxylic acid
  • These substances are at least trifunctional, preferably at least tetrafunctional.
  • the number of functional groups 3 to 16, preferably 4 to 10, particularly preferably 4 to 8. It will be in the Process according to the invention either at least trifunctional amines or at least trifunctional carboxylic acids used, but no mixtures corresponding amines or carboxylic acids. Small amounts of at least trifunctional amines can, however, be found in the trifunctional carboxylic acids be included and vice versa.
  • the substances are in the amount of 1 to 50 ⁇ mol / g polyamide, preferably 1 to 35, particularly preferably 1 to 20 ⁇ mol / g of polyamide.
  • the Substances in an amount of 3 to 150, particularly preferably 5 to 100, in particular Contain 10 to 70 ⁇ mol / g polyamide in equivalents.
  • the equivalents refer to the number of functional amino groups or Carboxylic acid groups.
  • Difunctional carboxylic acids or difunctional amines serve as chain extenders. They have 2 carboxylic acid groups that can be reacted with amino groups or 2 amino groups that can be reacted with carboxylic acids. Apart from the carboxylic acid groups or amino groups, the difunctional carboxylic acids or amines contain no further functional groups which can react with amino groups or carboxylic acid groups. They preferably do not contain any further functional groups. Examples of suitable difunctional amines are those which form salts with difunctional carboxylic acids. They can be linear aliphatic, such as C 1-14 -alkylenediamine, preferably C 2-6 -alkylenediamine, for example hexylenediamine. They can also be cycloaliphatic.
  • Examples are isophoronediamine, dicycycan, laromin.
  • Branched aliphatic diamines can also be used, for example Vestamin TMD (trimethylhexamethylene diamine, manufactured by Huls AG).
  • the entire amines can each be substituted by C 1-12 , preferably C 1-14 alkyl radicals on the carbon skeleton.
  • Difunctional carboxylic acids are, for example, those which form salts with difunctional diamines. They can be linear aliphatic dicarboxylic acids, which are preferably C 4-20 dicarboxylic acids. Examples are adipic acid, azelaic acid, sebacic acid, suberic acid. They can also be aromatic. Examples are isophthalic acid, terephthalic acid, naphthalenedicarboxylic acid, as well as dimerized fatty acids.
  • the difunctional basic building blocks (c) are preferably used in amounts of 1 to 55, particularly preferably 1 to 30, in particular 1 to 15 ⁇ m / g of polyamide are used.
  • the product mixture obtained in stage 3 or the second is carried liquid or second solid phase or the mixture of second liquid and second solid phase (from stage 4) which contain the polyamide, preferably a polymer melt, using conventional methods, for example with the help of a pump, from which Reaction vessel.
  • the polyamide obtained can then be used per se known methods, e.g. in DE-A 43 21 683 (p. 3, lines 54 to p. 4, Z. 3) are described in detail, work up.
  • the content of cyclic dimer further reduce in the polyamide-6 obtained according to the invention by the Polyamide first with an aqueous solution of caprolactam and then with Water extracted and / or the gas phase extraction (described for example in EP-A-0 284 968).
  • low molecular weight components such as caprolactam and its linear and cyclic Oligomers can be used in the first and / or second and / or third stage traced.
  • the starting mixture and the reaction mixture can in all stages Chain regulators such as aliphatic and aromatic carboxylic and dicarboxylic acids, and Catalysts, such as oxygen-containing phosphorus compounds, in amounts in the range from 0.01 to 5% by weight, preferably from 0.2 to 3% by weight, based on the amount of polyamide-forming monomers and aminonitriles used become.
  • Chain regulators are, for example, propionic acid, acetic acid, Benzoic acid, terephthalic acid and triacetone diamine.
  • Additives and fillers such as pigments, dyes and stabilizers are used in the Usually before granulation, preferably in the second, third and fourth stages of the Reaction mixture fed. Fillers and additives are then particularly preferred use if the reaction or polymer mixture in the further Process sequence no longer implemented in the presence of fixed bed catalysts becomes.
  • the additives can contain from 0 to 40% by weight, preferably from 1 to 30% by weight, based on the overall composition, of one or contain several impact-modifying rubbers.
  • Usual impact modifiers are used for polyamides and / or polyarylene ethers are suitable.
  • Rubbers that increase the toughness of polyamides generally have two main features: they contain an elastomeric component, the one Glass temperature of less than -10 ° C, preferably less than -30 ° C has, and they contain at least one functional group with the Polyamide can interact.
  • Suitable functional groups are, for example Carboxylic acid, carboxylic acid anhydride, carboxylic acid ester, carboxylic acid amide, Carboximide, amino, hydroxyl, epoxy, urethane and oxazoline groups.
  • EP or EPDM rubbers grafted with the above functional groups were grafted with Suitable grafting reagents.
  • Suitable grafting reagents are, for example, maleic anhydride, Itaconic acid, acrylic acid, glycidyl acrylate and glycidyl methacrylate.
  • These monomers can be in the melt or in solution, optionally in Presence of a radical initiator such as cumene hydroperoxide on the polymer be grafted on.
  • a radical initiator such as cumene hydroperoxide
  • copolymers of ⁇ -olefins described under polymer A including in particular, the ethylene copolymers can also be used instead of as polymer A. Rubbers used and the compositions of the invention as such be added.
  • Core-shell graft rubbers are another group of suitable elastomers to call. These are graft rubbers made in emulsion, which consist of at least one hard and one soft component. Under A hard component is usually understood to mean a polymer with a Glass temperature of at least 25 ° C, under a soft ingredient Polymer with a glass transition temperature of at most 0 ° C. These products exhibit a structure consisting of a core and at least one shell, the Structure results from the order of the monomer addition.
  • the soft ones Components are generally derived from butadiene, isoprene, alkyl acrylates, Alkyl methacrylates or siloxanes and optionally other comonomers.
  • Suitable siloxane cores can, for example, start from cyclic oligomers Octamethyltetrasiloxane or tetravinyltetramethyltetrasiloxane can be produced. These can be, for example, with ⁇ -mercaptopropylmethyldimethoxysilane in one ring opening cationic polymerization, preferably in the presence of Sulfonic acids, to be converted to the soft siloxane cores.
  • the siloxanes can also be networked by e.g.
  • Suitable comonomers are e.g. Styrene, acrylonitrile and crosslinking or graft-active monomers with more than one polymerizable double bond such as diallyl phthalate, divinylbenzene, butanediol diacrylate or triallyl (iso) cyanurate call.
  • the hard components are generally derived from styrene, ⁇ -methylstyrene and their copolymers, here as comonomers preferably acrylonitrile, methacrylonitrile and methyl methacrylate are to be listed.
  • Preferred core-shell graft rubbers contain one soft core and one hard shell or hard core, a first soft shell and at least one another hard shell.
  • the incorporation of functional groups such as carbonyl, Carboxylic acid, acid anhydride, acid amide, acid imide, carboxylic acid ester, amino, Hydroxyl, epoxy, oxazoline, urethane, urea, lactam or Halogenbenzyl groups, is preferably suitable here by the addition Functionalized monomers in the polymerization of the last shell.
  • suitable Functionalized monomers are, for example, maleic acid, maleic anhydride, Mono- or diester or maleic acid, tert-butyl (meth) acrylate, acrylic acid, Glycidyl (meth) acrylate and vinyl oxazoline.
  • the proportion of monomers with functional groups is generally 0.1 to 25 wt .-%, preferably 0.25 to 15 wt .-%, based on the total weight of the core-shell graft rubber.
  • the weight ratio of soft to hard components is generally 1: 9 to 9: 1, preferably 3: 7 to 8: 2.
  • Polyester elastomers are segmented Copolyetheresters understood the long chain segments that are typically of Poly (alkylene) ether glycols and short chain segments, which differ from derive low molecular weight diols and dicarboxylic acids. Such Products are known per se and are known in the literature, e.g. in US 3,651,014, described. Corresponding products are also under the names in the trade Hytrel® (Du Pont), Arnitel® (Akzo) and Pelprene® (Toyobo Co. Ltd.) available.
  • Processing aids, stabilizers, for example, are further additives and antioxidants, heat decomposition and decomposition agents ultraviolet light, lubricants and mold release agents, flame retardants, dyes and to name pigments and plasticizers. Their share is generally up to 40, preferably up to 15 wt .-%, based on the total weight of the Composition.
  • Pigments and dyes are generally in amounts up to 4, preferably 0.5 to 3.5 and in particular contain 0.5 to 3% by weight.
  • the pigments for coloring thermoplastics are generally known, see for example R. Gumbleter and H. Müller, Taschenbuch der Kunststoffadditive, Carl Hanser Verlag, 1983, pages 494 to 510.
  • the first preferred group of pigments are white pigments such as zinc oxide, zinc sulfide, Lead white (2 PbCO 3 Pb (OH) 2 ), lithopone, antimony white and titanium dioxide.
  • white pigments such as zinc oxide, zinc sulfide, Lead white (2 PbCO 3 Pb (OH) 2 ), lithopone, antimony white and titanium dioxide.
  • the rutile form is used in particular for the white coloring of the molding compositions according to the invention.
  • Black color pigments which can be used according to the invention are iron oxide black (Fe 3 O 4 ), spinel black (Cu (Cr, Fe) 2 O 4 ), manganese black (mixture of manganese dioxide, silicon dioxide and iron oxide), cobalt black and antimony black and particularly preferably carbon black, which is mostly used in the form of fumace or gas black (see G. Benzing, Pigments for paints, Expert Verlag (1988), p. 78ff).
  • inorganic can be used to adjust certain shades
  • Colored pigments such as chrome oxide green or organic colored pigments such as azo pigments and phthalocyanines are used according to the invention. Such pigments are common in the trade.
  • the thermoplastic mass can be added according to the invention are e.g. Halides of metals group I of the periodic table, e.g. Sodium, potassium, lithium halides, optionally in combination with copper (I) halides, e.g. Chlorides, bromides or Iodides.
  • the halides, especially of copper can also contain electron-rich p-ligands.
  • copper complexes be Cu halide complexes with e.g. Called triphenylphosphine. Farther zinc fluoride and zinc chloride can be used.
  • UV stabilizers are various substituted resorcinols, salicylates, Benzotriazoles and benzophenones, generally in amounts up to 2% by weight be used.
  • Lubricants and mold release agents which are usually in amounts up to 1% by weight of the thermoplastic mass are added are stearic acid, stearyl alcohol, Stearic acid alkyl esters and amides as well as esters of pentaerythritol with long-chain Fatty acids. Salts of calcium, zinc or aluminum can also be used Stearic acid and dialkyl ketones, e.g. Distearyl ketone can be used.
  • RV relative viscosity
  • the amino and carboxyl end group content was determined on extracted polycaprolactam and was carried out as an acidimetric titration.
  • the amino groups were as in phenol / methanol 70:30 (parts by weight) Titrated solvent with perchloric acid.
  • the carboxyl end groups were in Titrated benzyl alcohol as a solvent with potassium hydroxide solution.
  • K10® is an acid-treated montmorillonite from Süd-Chemie. It has a BET surface area of 180-220 m 2 / g and an ion exchange equivalent of 40-50 mVal / 100 g.
  • the catalyst used was obtained by intimately mixing the commercially available Titanium dioxide VKR 611 (from Sachtleben) with tungsten oxide and subsequent Extrusion obtained according to Example 2 or 4.
  • the first process stage (1) with an empty volume of 1 liter and an inner length of 1000 mm was completely filled with Raschig-Ring fillers (diameter 3 mm, length 3 mm, for comparison purposes) or with titanium dioxide granules (catalyst 4).
  • the granules consisted of 100% TiO 2 , which was present in the so-called anatase modification, and had a strand length between 2 and 14 mm, a strand thickness of approximately 4 mm and a specific surface area of approximately 50 m 2 / g.
  • a 2 liter separating tank was used as the second stage (2).
  • the third stage (3) was a flow tube filled with Raschig rings (diameter 6 mm, length 6 mm, for comparison purposes) or with the TiO 2 granulate described above (volume 1 l, length 1000 mm).
  • the fourth process stage (4) again consisted of a separating vessel (volume 2 1), from which the polymer melt produced was drawn out in the form of a strand with the aid of a gear pump (A).
  • the process parameters and the product properties are shown in the table below.
  • the “throughput” is the mass flow of the reaction mixture through the first process stage.

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  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Polyamides (AREA)
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Claims (9)

  1. Procédé continu de préparation d'un polyamide par réaction d'au moins un aminonitrile avec de l'eau, qui comprend les étapes suivantes :
    (1) une réaction d'au moins un aminonitrile avec de l'eau à une température de 90 à 400°C et à une pression de 0,1 à 35 x 106 Pa dans un tube d'écoulement qui contient un catalyseur à base d'acide de Brönsted, choisi parmi un catalyseur à zéolite bêta, un catalyseur à silicate lamellaire ou un catalyseur à dioxyde de titane constitué de 70 à 100% en poids d'anatase et de 0 à 30% en poids de rutile, dans lequel jusqu'à 40% en poids du dioxyde de titane peuvent être remplacés par de l'oxyde de tungstène, un mélange réactionnel étant obtenu,
    (2) une réaction supplémentaire du mélange réactionnel à une température de 150 à 400°C et à une pression, qui est inférieure à la pression de l'étape 1, réaction qui peut être effectuée en présence d'un catalyseur à base d'acide de Brönsted, choisi parmi un catalyseur à zéolite bêta, un catalyseur à silicate lamellaire ou un catalyseur à dioxyde de titane constitué de 70 à 100% en poids d'anatase et de 0 à 30% en poids de rutile, dans lequel jusqu'à 40% en poids du dioxyde de titane peuvent être remplacés par de l'oxyde de tungstène, la température et la pression étant choisies de façon à obtenir une première phase gazeuse et une première phase liquide ou une première phase solide ou un mélange de première phase solide et de première phase liquide, et à isoler la première phase gazeuse de la première phase liquide ou de la première phase solide ou du mélange de première phase liquide et de première phase solide, et
    (3) une addition, à la première phase liquide ou à la première phase solide ou au mélange de première phase liquide et de première phase solide, d'une phase gazeuse ou liquide qui contient de l'eau, à une température de 150 à 370°C et à une pression de 0,1 à 30 x 106 Pa, éventuellement dans un tube d'écoulement qui contient un catalyseur à base d'acide de Brönsted, choisi parmi un catalyseur à zéolite bêta, un catalyseur à silicate lamellaire ou un catalyseur à dioxyde de titane constitué de 70 à 100% en poids d'anatase et de 0 à 30% en poids de rutile, dans lequel jusqu'à 40% en poids du dioxyde de titane peuvent être remplacés par de l'oxyde de tungstène, un mélange produit étant obtenu.
  2. Procédé suivant la revendication 1, qui comprend en supplément l'étape suivante :
    (4) une post-condensation du mélange produit à une température de 200 à 350°C et à une pression, qui est inférieure à la pression de l'étape 3, la température et la pression étant choisies de façon à obtenir une deuxième phase gazeuse contenant de l'eau et de l'ammoniac et une deuxième phase liquide ou une deuxième phase solide ou un mélange de deuxième phase liquide et de deuxième phase solide, qui contient respectivement le polyamide.
  3. Procédé continu de préparation d'un polyamide par réaction d'au moins un aminonitrile avec de l'eau, qui comprend les étapes suivantes :
    (1) une réaction d'au moins un aminonitrile avec de l'eau à une température de 90 à 400°C et à une pression de 0,1 à 35 x 106 Pa dans un tube d'écoulement, qui contient un catalyseur à base d'acide de Brönsted, choisi parmi un catalyseur à zéolite bêta, un catalyseur à silicate lamellaire ou un catalyseur à dioxyde de titane constitué de 70 à 100% en poids d'anatase et de 0 à 30% en poids de rutile, dans lequel jusqu'à 40% en poids du dioxyde de titane peuvent être remplacés par de l'oxyde de tungstène, un mélange réactionnel étant obtenu,
    (2) une réaction supplémentaire du mélange réactionnel à une température de 150 à 400°C et à une pression, qui est inférieure à la pression de l'étape 1, réaction qui peut être effectuée en présence d'un catalyseur à base d'acide de Brönsted, choisi parmi un catalyseur à zéolite bêta, un catalyseur à silicate lamellaire ou un catalyseur à dioxyde de titane constitué de 70 à 100% en poids d'anatase et de 0 à 30% en poids de rutile, dans lequel jusqu'à 40% en poids du dioxyde de titane peuvent être remplacés par de l'oxyde de tungstène, la température et la pression étant choisies de façon à obtenir une première phase gazeuse et une première phase liquide ou une première phase solide ou un mélange de première phase solide et de première phase liquide et à isoler la première phase gazeuse de la première phase liquide ou de la première phase solide ou du mélange de première phase liquide et de première phase solide, et
    (4) une post-condensation de la première phase liquide ou de la première phase solide ou du mélange de première phase liquide et de première phase solide à une température de 200 à 350°C et à une pression qui est inférieure à la pression de l'étape 2, la température et la pression étant choisies de façon à obtenir une deuxième phase gazeuse contenant de l'eau et de l'ammoniac et une deuxième phase liquide ou une deuxième phase solide ou un mélange de deuxième phase liquide et de deuxième phase solide, qui contient respectivement le polyamide.
  4. Procédé suivant l'une des revendications 1 à 3, dans lequel, dans l'étape 1 ou dans l'étape 3 ou aussi bien dans l'étape 1 que dans l'étape 3, la température et la pression sont choisies de façon à obtenir une phase liquide ou une phase solide ou un mélange de phase liquide et de phase solide et une phase gazeuse et à isoler la phase gazeuse.
  5. Procédé suivant l'une des revendications 1 à 4, dans lequel la réaction selon l'étape 1 est effectuée à un rapport molaire entre l'aminonitrile et l'eau de 1/1 à 1/30.
  6. Procédé suivant l'une des revendications 1 à 5, dans lequel, dans l'étape 3, la phase gazeuse ou liquide, qui contient de l'eau, est ajoutée en une quantité de 50 à 1.500 ml d'eau par 1 kg de première phase liquide ou de première phase solide ou de mélange de première phase liquide et de première phase solide.
  7. Procédé suivant l'une des revendications 1 à 6, dans lequel au moins une des phases gazeuses obtenues dans les étapes respectives est recyclée dans au moins une des étapes précédentes.
  8. Procédé suivant l'une des revendications 1 à 7, dans lequel on fait réagir, comme aminonitrile, un ω-aminoalkylnitrile comportant un radical alkylène (-CH2-) de 4 à 12 atomes de C ou un aminoalkylarylnitrile comportant 8 à 13 atomes de C.
  9. Procédé suivant l'une des revendications 1 à 8, dans lequel on met en oeuvre le mélange suivant : de 50 à 99,99% en poids de 6-aminocapronitrile, de 0,01 à 50% en poids d'au moins un acide dicarboxylique, choisi parmi le groupe constitué des acides α,ω-dicarboxyliques en C4-C10 aliphatiques, des acides dicarboxyliques en C8-C12 aromatiques et des acides cycloalcanedicarboxyliques en C5-C8, de 0 à 50% en poids d'une α,ω-diamine comportant 4 à 10 atomes de carbone, de 0 à 50% en poids d'un α,ω-dinitrile en C2-C12, ainsi que de 0 à 50% en poids d'un α,ω-aminoacide en C5-C12 ou du lactame correspondant, de 0 à 10% en poids d'au moins un acide inorganique ou de son sel,
    la somme des différentes données en % en poids étant de 100%.
EP99910175A 1998-02-02 1999-02-02 Procede en continu pour produire des polyamides a partir d'aminonitriles Expired - Lifetime EP1054919B1 (fr)

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DE19804023 1998-02-02
DE19804023A DE19804023A1 (de) 1998-02-02 1998-02-02 Kontinuierliches Verfahren zur Herstellung von Polyamiden aus Aminonitrilen
PCT/EP1999/000654 WO1999038908A1 (fr) 1998-02-02 1999-02-02 Procede en continu pour produire des polyamides a partir d'aminonitriles

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DE19846014A1 (de) * 1998-10-06 2000-04-13 Basf Ag Beschleuniger für die Herstellung von Polyamiden aus Aminonitrilen
JP2002528581A (ja) * 1998-10-26 2002-09-03 イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー オメガ−アミノニトリルからポリアミドを製造する連続重合方法
DE19935398A1 (de) * 1999-07-30 2001-02-01 Basf Ag Verfahren zur Herstellung von Polyamiden aus Dinitrilen und Diaminen
DE19962573A1 (de) * 1999-12-23 2001-07-05 Basf Ag Verfahren zur Herstellung von Polyamiden
DE10033544A1 (de) * 2000-07-11 2002-01-24 Basf Ag Kontinuierliches Verfahren zur Herstellung von Polyamiden aus Aminonitrilen
US6437089B1 (en) * 2001-06-01 2002-08-20 E. I. Du Pont De Nemours And Company Process for the production of nylon 6
DE10217439A1 (de) * 2002-04-18 2003-10-30 Basf Ag Verfahren zur Herstellung von Polyamiden
CN1308374C (zh) * 2002-08-30 2007-04-04 东洋纺织株式会社 聚酰胺的连续制备方法
DE10313682A1 (de) * 2003-03-26 2004-10-07 Basf Ag Verfahren zur Herstellung von Polyamiden
DE102004006955A1 (de) 2004-02-12 2005-09-01 Basf Ag Kontinuierliches Verfahren zur Herstellung von Polyamiden
DE102004027022A1 (de) * 2004-06-02 2006-01-05 Basf Ag Verfahren zur Abtrennung von Ammoniak und Wasser aus Lactam-haltigen Gemischen
FR2914308B1 (fr) * 2007-03-27 2009-05-01 Rhodia Recherches & Tech Procede de fabrication de polyamide
FR2981600B1 (fr) 2011-10-25 2013-11-15 Rhodia Operations Procede de preparation de granules de polyamide

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US2301964A (en) * 1941-09-12 1942-11-17 Du Pont Method of preparing lactams
US4568736A (en) 1984-09-17 1986-02-04 The Standard Oil Company Preparation of polyamide from omega-aminonitrile with oxygen containing phosphorus catalyst
US4628085A (en) * 1985-09-03 1986-12-09 Allied Corporation Use of silica catalyst for selective production of lactams
US4625023A (en) * 1985-09-03 1986-11-25 Allied Corporation Selective conversion of aliphatic and aromatic aminonitriles and/or dinitriles into lactams
DE3534817A1 (de) 1985-09-30 1987-04-02 Davy Mckee Ag Verfahren zur herstellung von polyamid
US5109104A (en) * 1990-10-04 1992-04-28 E. I. Du Pont De Nemours And Company Preparation of polyamides from omega-aminonitriles
DE4339648A1 (de) * 1993-11-20 1995-05-24 Basf Ag Verfahren zur Herstellung von Caprolactam
DE4443125A1 (de) * 1994-12-03 1996-06-05 Basf Ag Verfahren zur Herstellung von Caprolactam
DE19635077A1 (de) 1996-08-30 1998-03-05 Basf Ag Verfahren zur kontinuierlichen Herstellung von Polyamiden aus omega-Aminoalkylnitrilen
DE19709390A1 (de) * 1997-03-07 1998-09-10 Basf Ag Verfahren zur Herstellung von Polyamiden aus Aminonitrilen
KR100539338B1 (ko) 1996-08-30 2005-12-28 바스프 악티엔게젤샤프트 아미노니트릴로부터 폴리아미드의 제조방법

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WO1999038908A1 (fr) 1999-08-05
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